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<body class="container">
    <h3 align="center">丰富的菜单内容</h3>
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        <button type="button" class="btn btn-primary dropdown-toggle position-relative" data-bs-toggle="dropdown">
            老码识途课堂
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        <div class="dropdown-menu" style="max-width: 300px;">
            <h6 class="dropdown-header" type="button">经典课程</h6>
            <button class="dropdown-item" type="button">热门课程</button>
            <button class="dropdown-item" type="button">技术支持</button>
            <hr>
            <p class="mx-3">老码识途课堂为读者提供核心技术的培训和指导。</p>
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                <input type="text" placeholder="姓名"><br />
                <textarea type="textarea" cols="22" rows="4" placeholder="技术疑难问题"></textarea>
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